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Loan Receivables and Allowance for Loan Losses - Summarizes Impaired Loans (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance | $ 13,966,000 | $ 14,485,000
Recorded investments with an allowance | 6,967,000 | 7,508,000
Recorded Investment, Total | 20,933,000 | 21,993,000
Unpaid principal with no related allowance | 17,564,000 | 18,194,000
Unpaid principal with an allowance | 7,294,000 | 7,920,000
Unpaid Principal Balance, Total | 24,858,000 | 26,114,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance | 1,800,000 | 1,891,000
Related Allowance, Total | 1,800,000 | 1,891,000
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance | 2,000 | 2,000
Recorded investments with an allowance | 6,050,000 | 6,150,000
Recorded Investment, Total | 6,052,000 | 6,152,000
Unpaid principal with no related allowance | 160,000 | 151,000
Unpaid principal with an allowance | 6,050,000 | 6,150,000
Unpaid Principal Balance, Total | 6,210,000 | 6,301,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance | 1,500,000 | 1,500,000
Related Allowance, Total | 1,500,000 | 1,500,000
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance | 8,699,000 | 7,597,000
Recorded investments with an allowance | 156,000 | 170,000
Recorded Investment, Total | 8,855,000 | 7,767,000
Unpaid principal with no related allowance | 9,537,000 | 8,316,000
Unpaid principal with an allowance | 210,000 | 215,000
Unpaid Principal Balance, Total | 9,747,000 | 8,531,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance | 17,000 | 31,000
Related Allowance, Total | 17,000 | 31,000
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance |  |
Recorded investments with an allowance | 260,000 | 260,000
Recorded Investment, Total | 260,000 | 260,000
Unpaid principal with no related allowance |  |
Unpaid principal with an allowance | 487,000 | 487,000
Unpaid Principal Balance, Total | 487,000 | 487,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance | 260,000 | 260,000
Related Allowance, Total | 260,000 | 260,000
Construction to Permanent [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance |  | 1,197,000
Recorded investments with an allowance |  |
Recorded Investment, Total |  | 1,197,000
Unpaid principal with no related allowance |  | 1,425,000
Unpaid principal with an allowance |  |
Unpaid Principal Balance, Total |  | 1,425,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance |  | 2,188,000
Related Allowance, Total |  |
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance | 4,680,000 | 5,098,000
Recorded investments with an allowance | 499,000 | 926,000
Recorded Investment, Total | 5,179,000 | 6,024,000
Unpaid principal with no related allowance | 7,203,000 | 7,632,000
Unpaid principal with an allowance | 545,000 | 1,066,000
Unpaid Principal Balance, Total | 7,748,000 | 8,698,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance | 21,000 | 98,000
Related Allowance, Total | 21,000 | 98,000
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investments with no related allowance | 585,000 | 591,000
Recorded investments with an allowance | 2,000 | 2,000
Recorded Investment, Total | 587,000 | 593,000
Unpaid principal with no related allowance | 664,000 | 670,000
Unpaid principal with an allowance | 2,000 | 2,000
Unpaid Principal Balance, Total | 666,000 | 672,000
Related Allowance with no related allowance |  |
Related Allowance with an allowance | 2,000 | 2,000
Related Allowance, Total | $ 2,000 | $ 2,000

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524 + Details
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